Retainer clamp



FIG. 1 is a perspective view of the retainer clamp;

FIG. 2 is a top plan view of the retainer clamp;

FIG. 3 is a bottom plan view of the retainer clamp;

FIG. 4 is a front elevation view of the retainer clamp, the rear elevation view being a mirror image and not shown; and,

FIG. 5 is a left side elevation view of the retainer clamp, the right side elevation view being a mirror image and not shown. 

CLAIM I claim the ornamental design for the retainer clamp, as shown and described. 